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Wyświetlanie 1-15 z 17
Tytuł:
Wear Characteristics of Hardfacing Coatings Obtained by Tungsten Inert Gas Method
Autorzy:
Dziedzic, Krzysztof
Józwik, Jerzy
Barszcz, Marcin
Gauda, Konrad
Powiązania:
https://bibliotekanauki.pl/articles/102365.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
coatings
hardfacing
welding
wear
powłoki
napawanie
spawanie
zużycie
Opis:
This paper evaluates the wear characteristics of hardfacing coatings. Regenerative hardfacing coatings were applied with the TIG (Tungsten Inert Gas) method. The solid welding wires were used to obtain the coatings marked as: EL-500 HB, EL-650 HB, and EL-3348. The tribological analysis of samples was conducted at room temperature. The wear rate was evaluated with a THT 1000 Anton Parr ball-on-disc tribotester, in accordance with the ASTM G-133 standard. The counterbody (static partner) consisted of balls with the diameter of 6 mm made of Al2O3. The test was performed with the sliding speed of the friction pair 0.4 m/s, track radius 10 mm, normal load 20 N, acquisition rate 10 Hz and sliding distance 2000 m. During the test, the friction coefficient and wear rate were recorded. The multi-criteria assessment of the construction materials discussed, while taking into account five criteria, showed that EL-3348 HB is the best material. Computer applications were used for multi-criteria assessment and statistical processing of data.
Źródło:
Advances in Science and Technology. Research Journal; 2019, 13, 4; 8-14
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Surface Texturing on a CNC Machine Tool Using a Laser
Autorzy:
Józwik, Jerzy
Dziedzic, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/2201901.pdf
Data publikacji:
2023
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
laser micromachining
laser surface texturing
CNC machine tool
surface topography
Opis:
In the paper stages of the process of constituting a surface with the texture of the injection mold of a wheeled vehicle steering wheel using laser technology was discusses. During micromachining process with texturing there is a 5-axis CNC-controlled CNC machine TOOL LASERTEC 65 Shape used with a rigid monoBLOCK structure with Siemens 840D sl control, equipped with a fiber laser with a power of 100W, a wavelength of 1064 nm and a focal length of 181 mm. Processing technology was prepared using Autodesk Maya, Adobe Photoshop, Adobe Illustrator, NX9, Lastex v. 2.27.26 computer programs and machine tool control systems. Results of machining the steering wheel of a wheeled vehicle with a concentrated laser beam are discussed. Geometric structure of the surface after texturing was evaluated. Presented technology can be used to obtain the desired texture properties on the surface of the parts.
Źródło:
Advances in Science and Technology. Research Journal; 2023, 17, 1; 160--172
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Strength of threaded connections additively produced from polymeric materials
Wytrzymałość połączeń gwintowych wytwarzanych przyrostowo z materiałów polimerowych
Autorzy:
Dziubek, Tomasz
Budzik, Grzegorz
Kawalec, Andrzej
Dębski, Mariusz
Turek, Paweł
Oleksy, Mariusz
Paszkiewicz, Andrzej
Poliński, Przemysław
Kochmański, Łukasz
Kiełbicki, Mateusz
Józwik, Jerzy
Kuric, Ivan
Cebulski, Józef
Powiązania:
https://bibliotekanauki.pl/articles/2200485.pdf
Data publikacji:
2022
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
Tematy:
additive manufacturing
polymers
screw strength
tensile stresses
shear stresses
wytwarzanie przyrostowe
polimery
wytrzymałość śruby
naprężenia rozciągające
naprężenia ścinające
Opis:
The article presents the results of strength tests of screw-nut threaded connections made of polymeric materials such as: ABS, PLA, PET-G and acrylic resin. In order to make physical models, three 3D printing techniques were used: Fused Deposition Modeling (FDM), Fused Filament Fabrication (FFF), and PolyJet. The tests took into account the stresses caused by the axial force generated when the bolt is screwed into the nut or other structural element. Due to the complexity of the issue, the presented studies are only a starting point for further research.
W artykule przedstawiono wyniki badań wytrzymałości połączeń gwintowych śruba-nakrętka wykonanych z materiałów polimerowych takich, jak: ABS, PLA, PET-G i żywicy akrylowej. Do wykonania modeli fizycznych stosowano trzy techniki druku 3D: FDM, FFF i PolyJet. W badaniach uwzględniono naprężenia spowodowane działaniem siły osiowej powstającej podczas wkręcania śruby w nakrętkę lub inny element konstrukcyjny. Ze względu na złożoność zagadnienia, przedstawione badania stanowią punkt wyjścia do dalszych badań.
Źródło:
Polimery; 2022, 67, 6; 261--270
0032-2725
Pojawia się w:
Polimery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microbiological Analysis of Coolant Used in Machining
Autorzy:
Józwik, Jerzy
Zawada-Michałowska, Magdalena
Budzik, Grzegorz
Legutko, Stanislaw
Kupczyk, Maciej Jan
Powiązania:
https://bibliotekanauki.pl/articles/2201920.pdf
Data publikacji:
2023
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
metalworking fluids
CNC machining
cooling properties
lubricating properties
microorganism
microorganisms
Opis:
The subject of microbiological tests of coolants presented in the work is the cutting fluid (emulsifying oil) of Fuchs ECOCOOL 68 CF3. The liquid was taken from the tanks of three different numerically controlled machines (Lasertec 65, MillTap 700, CTX beta 1250 TC), used with different intensity. The five most characteristic and popular media were used in the study: nutrient agar - plain, TSA medium (tryptone-soy-agar), medium with dichloran, rose bengal and chloramphenicol, Sabouraud agar with Chloramphenicol, Czapka agar. The incubation time was dependent on the type of microorganisms. After the specified time, the plates inoculated on the medium were subjected to visual observations and under the Leica DM 500 microscope. As a result of the observation, the following types of microorganisms (fungi and bacteria) were detected: Aspergillus Niger Tiegh, Candida Albicans, Saphylococcus Aureus, Micrococcus Luteus and Escherchia Coli and Citrobacter Freundia. The assessments were made in fixed periods. The results are presented as a function of the intensity of the use of cutting fluids. Microbiological analysis of machining fluids will allow for optimizing the time periods of using coolants and will also contribute to the protection of the operator's health and indirectly "extending the life cycle" of the technological machine.
Źródło:
Advances in Science and Technology. Research Journal; 2023, 17, 2; 206--214
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Geometrical Accuracy of Threaded Elements Manufacture by 3D Printing Process
Autorzy:
Budzik, Grzegorz
Dziubek, Tomasz
Kawalec, Andrzej
Turek, Paweł
Bazan, Anna
Dębski, Mariusz
Józwik, Jerzy
Poliński, Przemysław
Kiełbicki, Mateusz
Kochmański, Łukasz
Oleksy, Mariusz
Cebulski, Józef
Paszkiewicz, Andrzej
Kuric, Ivan
Powiązania:
https://bibliotekanauki.pl/articles/2201896.pdf
Data publikacji:
2023
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
additive manufacturing
surface roughness
computer measurement system
threaded elements
Opis:
Additive processes allow for almost any manufacturing of screw-threaded joint elements. However, this requires knowledge of the geometrical relationships of a threaded itself and the strength of materials from which the screw-threaded joint is made. Thanks to the development of research models and conducting tests related to dimensional accuracy and surface roughness, it was possible to test the models made by MEX process of ABS-M30, PLA, ABS, PETG materials, and PolyJet process from RGD720 polymer material.In the case of measurements carried out on the MarSurf XC20 system, the internal and external thread profile was obtained.Measurements of the surface roughness of the printed models were made using the Taylor Hobson TalyScan 150 profilometer. Based on the obtained surface, following the ISO 25178-2 standard, selected parameters were determined.
Źródło:
Advances in Science and Technology. Research Journal; 2023, 17, 1; 35--45
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of changes in fuel delivery rate by electromagnetic injectors in a common rail system during simulated operation
Autorzy:
Kamiński, Mariusz
Budzyński, Piotr
Hunicz, Jacek
Józwik, Jerzy
Powiązania:
https://bibliotekanauki.pl/articles/1841746.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
common rail
fuel delivery rate
injector operation
Opis:
The objective of this study was to determine changes in fuel delivery rate by common rail system injectors during their simulated operation on a test stand. Four Bosch injectors used, among others, in Fiat 1.3 Multijet engines were tested. The injectors were operated on a test rig at room temperature for 500 hours (more than 72 million work cycles). During the test, pressure and injection frequency were changed. Changes in the operating parameters were estimated based on obtained injection characteristics and effective flow area determined thereby. The observed changes in fuel delivery rate were compared with results of the surface analysis of control valves and nozzle needles. Despite the stated lack of wear, significant changes in the dynamics of injector operation were observed, particularly at short injection times. Small pilot injections cannot be corrected by the fuel injection control system because they do not affect the changes in torque; however, they do affect the combustion process. This creates conditions for increased emission of toxic exhaust components.
Źródło:
Eksploatacja i Niezawodność; 2021, 23, 2; 352-358
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamic Analysis of the Starting and Braking of the Table of CNC Machine Tool
Autorzy:
Józwik, Jerzy
Zawada-Michałowska, Magdalena
Moń, Damian
Powiązania:
https://bibliotekanauki.pl/articles/2201776.pdf
Data publikacji:
2022
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
dynamics analysis
vision systems
CNC machine tool
feed rate
CNC machine tools accuracy
CNC machine table
Opis:
The aim of the paper is a dynamic analysis of the starting and braking of the table of a numerically controlled CNC machine tool during idle motion. The experimental test was performed on the vertical table of the FV580A machining centre using the Phantom v1610 high-speed vision camera. The dynamics characteristics of the table movement were registered and the dynamics estimates of the movement were determined. The influence estimation of the parameters of the machine tool table motion on the value of the determined estimates was made. The results of measurements were discussed and guidelines and in order to minimise disturbances were formulated. The test results were summarised and discussed in the form of charts and tables. The directions of further research in the discussed subject area were also defined
Źródło:
Advances in Science and Technology. Research Journal; 2022, 16, 3; 34--46
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cutting Forces and 3D Surface Analysis of CFRP Milling
Autorzy:
Biruk-Urban, Katarzyna
Józwik, Jerzy
Bere, Paul
Powiązania:
https://bibliotekanauki.pl/articles/2172348.pdf
Data publikacji:
2022
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
milling
cutting force
CFRP
Opis:
Due to the wide application of Carbon Fiber Reinforced Polymer (CFRP) composites in various industries, more and more attention is paid to machining these materials. One of the most popular way of machining composites is the milling. Milling of composite materials (CM) is a difficult technology due to their anisotropic and heterogeneous structure and the fact that the reinforcing fibers have an intense abrasive effect on the tool edge during machining. The appropriate selection of technological cutting parameters as well as the type and geometry of the tool can significantly affect the value of cutting forces during milling and the quality of the surface after machining. The aim of the paper is to assess the influence of used tools (differing in the number of cutting edges) and various technological parameters of surface milling of CFRP composites on the cutting forces occurring during machining and on the surface quality after machining. Cutting forces were measured during the milling process on a special stand produced by Kistler and the roughness measurements and surface structure were analyzed using the Alicona InfiniteFocusG5 3D optical microscope. On the basis of performed research it was found that 14 edge tool gives lower values of Fx and Fy components of the cutting forces comparing to 2 edge tool, which is especially noticeable at higher cutting speed values vc=160 m/min, where the values of Fx and Fy components decreased by about 43% at fz=0.0030 mm/tooth. This tool gives also lower values of the Sa roughness parameter 1.65 µm.
Źródło:
Advances in Science and Technology. Research Journal; 2022, 16, 2; 206--215
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Combined Effect of CrB2 Micropowder and VN Nanopowder on the Strength and Wear Re-sistance of Fe‒Cu–Ni–Sn Matrix Diamond Composites
Autorzy:
Ratov, Boranbay
Mechnik, Volodymyr
Rucki, Miroslaw
Gevorkyan, Edwin
Kilikevicius, Arturas
Kolodnitskyi, Vasyl
Siemiatkowski, Zbigniew
Umirova, Gulzada
Chałko, Leszek
Józwik, Jerzy
Zhanggirkhanova, Arailym
Chishkala, Vladimir
Korostyshevskyi, Dmytro
Powiązania:
https://bibliotekanauki.pl/articles/2201897.pdf
Data publikacji:
2023
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
diamond composite
electroconsolidation
composite microstructure
adhesion
CrB2
VN nanopowder
micropowder
VN
wear resistance
cutting tools
mining tools
Opis:
The paper presents research results on the enhancement of diamond composites designed for tools application for mining industry, hard rocks cutting, able to withstand harsh conditions under heavy dynamical loads. In the present study, both CrB2 micropowder and VN nanopowder additives were used in proportions up to 5 wt.% and 6 wt.%, respectively, together with the basic matrix composition of 51 wt.% Fe, 32 wt.% Cu, 9 wt.% Ni, and 8 wt.% Sn. Addition of both components, CrB2 and VN, appeared to be ad-vantageous in proportion of 2 wt.% and 4 wt.%, respectively. This composition exhibited the highest relative density of 0.9968, better than that without additives. Similarly, the highest values of compressive strength Rcm and flexural strength Rbm were reached for the composite with the same percentage of CrB2 and VN. Compared to the composite with no addition of CrB2 and VN, Rcm improved by almost 70%, while Rbm by 81%. Additionally, the abovementioned additives enhanced the ability of the matrix to prevent the diamond reinforcement from being torn out of the composite, which is very important under harsh working conditions of the cutting tools. The presence of CrB2 micropowder and VN nanopowder promoted densification of the matrix and adhesion between the diamond grits and the Fe‒Cu–Ni–Sn matrix.
Źródło:
Advances in Science and Technology. Research Journal; 2023, 17, 1; 23--34
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of Plasma Actuator with Two Mesh Electrodes to Active Control of Boundary Layer at 50 Hz Power Supply
Autorzy:
Gnapowski, Ernest
Pytka, Jarosław
Gnapowski, Sebastian
Józwik, Jerzy
Tomiło, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/2201893.pdf
Data publikacji:
2023
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
plasma actuator
DBD
lift coefficient
mesh electrode
Opis:
Numerous studies are conducted to improve the flow in the boundary layer to ensure laminar flow and in particular to increase flight safety. A new solution used to improve the laminar flow is the plasma actuator. The classic configuration of DBD plasma actuators is commonly used with the asymmetric electrode system. The manuscript describes the results of tests with a plasma actuator. Experimental tests were carried out on the built model of the wing with the SD 7003 profile, a plasma actuator was mounted on the upper surface. In contrast to the commonly used solution with solid tape copper electrodes, the novelty in the described research in the manuscript is the use of a large GND electrode (covering 70% of the upper surface of the wing) and a HV mesh electrode. The use of a plasma actuator on the upper surface of the wing affects the air flow in the boundary layer as a result of air ionization. The tests were carried out for a supply voltage from V = 7.0 kV to 12 kV and Reynolds number, Re = 87500 to 240000, flow velocity during the tests in the tunnel was in the range of U = 5-15 m/s and the angle of attack α = 5 -15 degrees. On the basis of the results experimental tests, the percentage change in the lift coefficient was calculated for the switched on and off DBD system. The obtained results indicate a maximum 17% increase in the lift coefficient for the plasma actuator activated for air flow U = 5 m/s and angle of attack α = 5 degrees. In the remaining configurations, changes in the lift coefficient amounted to 4%.
Źródło:
Advances in Science and Technology. Research Journal; 2023, 17, 1; 58--63
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of Torsional Strength of Pa2200 Material Shape Additively with the Selective Laser Sintering Technology
Autorzy:
Bernaczek, Jacek
Dębski, Mariusz
Gontarz, Małgorzata
Grygoruk, Roman
Józwik, Jerzy
Kozik, Bogdan
Mikulski, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/2201927.pdf
Data publikacji:
2023
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
torsional strength
PA2200 powder
additive manufacturing
SLS technology
SLS
Selective Laser Sintering
optical measurements
3D scanning
Opis:
The purpose of the undertaken research work is to analyze the torsional strength of standard samples with a circular cross-section, produced additively using the SLS (Selective Laser Sintering) technique – sintering PA2200 polyamide powders. The studies conducted so far have not included a static torsion test, the results of which are crucial for parts such as machine shafts, hubs, couplings, etc. Hence the idea of conducting the research in question. The samples were made in different settings relative to the machine's working platform and subjected to post-processing in two variants – by water-soaking and furnace-heating – in order to determine the influence of the orientation of the model in the manufacturing process and the type of post-processing on torsional strength. The produced samples were additionally subjected to a preliminary dimensional and shape verification due to the significant impact of the accuracy of the models in the SLS process on the operation of the above-mentioned machine parts. Based on the analysis of the test results, it was found that the highest torsional strength was determined for the furnace-heated samples. In addition, the highest mapping accuracy was found for models positioned vertically in relation to the machine's working platform.
Źródło:
Advances in Science and Technology. Research Journal; 2023, 17, 2; 12--24
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza wyników samodzielnej radioterapii chorych na raka endometrium
Radiotherapy as sole treatment of endometrial cancer. Analysis of treatment outcome
Autorzy:
Jóźwik, Piotr
Karolewski, Kazimierz
Kojs, Zbigniew
Jakubowicz, Jerzy
Blecharz, Paweł
Urbański, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/908391.pdf
Data publikacji:
2007
Wydawca:
Medical Communications
Tematy:
brachytherapy
endometrial cancer
irradiation
radiotherapy
Opis:
Radiotherapy was used as a stand-alone therapeutic modality in 155 patients with endometrial cancer, treated at the Cracow Branch of the Center of Oncology since 1988 thru 1999. In these patients surgical excision was impossible due to far-advanced cancer (clinical stages III and IV) (n=50), severe comorbidity and poor performance status (n=105). In this patient population, 50 persons in clinical stage I received intracavitary brachytherapy, while the remaining 105 patients in clinical stages II, III and IVA received external beam irradiation followed by intracavitary brachytherapy. In the entire group (n=155), cumulative symptom-free 5 year survival rate was 51% (n=79). In relation to tumour grade, 5 year symptom- free survival rate was 70.3% in patients with well differentiated tumour, 43.5% in those with intermediate- grade tumour and only 20% in persons with poorly differentiated cancer. In patients with stage I endometrial cancer, symptom-free 5 year survival rate was 82% (n=41/50); in clinical stage II – 54.5% (30/55), in clinical stages III and IVA – 16% (8/50). Multivariate Cox analysis revealed that independent prognostic factors were clinical stage and tumour grade. Cure rates were 82%, 54.4% and 16% in clinical stages I, II and III/IVA, respectively. Symptom-free 5-year survival rates were 70.3%, 43.5% and 20% in well-differentiated, intermediate- and poorly-differentiated tumours, respectively. Severe late complications of radiotherapy (3rd and 4th degree) developed in 3.5% of patients.
W latach 1988-1999 w krakowskim Oddziale Centrum Onkologii (COOK) leczono pierwotnie napromienianiem 155 chorych na raka endometrium (RE), u których niemożliwe było wykonanie zabiegu operacyjnego z powodu zbyt dużego zaawansowania raka (stopnie III i IV) (50 chorych), ciężkich chorób towarzyszących i złego stanu sprawności (105 chorych). U 50 chorych na RE w I stopniu zaawansowania zastosowano wyłącznie brachyterapię dojamową, u pozostałych 105 (stopnie II, III i IVA) brachyterapię dojamową skojarzono z uprzednią teleradioterapią. Spośród 155 chorych badanej grupy 79 pacjentek (51%) przeżyło 5 lat bez objawów nowotworu. Pięć lat bez objawów nowotworu przeżyło 70,3% chorych na wysoko zróżnicowanego, 43,5% na średnio zróżnicowanego i 20% na nisko zróżnicowanego raka. Spośród 50 chorych na raka w I stopniu zaawansowania 5 lat bez objawów choroby przeżyło 41 (82%) pacjentów, spośród 55 chorych na raka w II stopniu zaawansowania - 30 (54,5%), a spośród 50 chorych na raka w stopniach III i IVA - tylko 8 (16%). W wielocechowej analizie Coksa niezależnymi czynnikami prognostycznymi były zaawansowanie kliniczne i stopień zróżnicowania raka. Wyleczono 82% chorych na RE w I stopniu zaawansowania, 54,5% w II stopniu i tylko 16% w stopniach III i IVA. Pięć lat bez objawów nowotworu przeżyło odpowiednio 70,3%, 43,5% i 20% chorych na wysoko, średnio i nisko zróżnicowanego raka. Odległe, ciężkie powikłania (stopnie 3. i 4.) radioterapii wystąpiły jedynie u 3,5% chorych.
Źródło:
Ginekologia Onkologiczna; 2007, 5, 3; 151-158
1731-5379
Pojawia się w:
Ginekologia Onkologiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 17

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